Blake is very much like Gonzalez was the more I think about it. Both had solid rally backhands and they could "lull" you in off that side and then as soon as they get a forehand, bam, complete change of pace.
i don't think they have much similarities. Gonzo was well known for perhaps one of the biggest FHs on tour, while James is more known for his awesome BH.
Gonzo was a solid clay performer, James has always been a typical American hard courts player.
James is a very decent volleyer, Fernando not so much, etc.
They're just two different players part of a beautiful era in this sport.